Reamer.



REAMER.

' APPLICATION FILED JULY 19, I916. 1,%3,@%; I Patented July 10, 1917.

WILLIAM H. ERICK, OF PHILADELPHIA, PENNSYLVANIA.

BEAMER.

Specification of Letters Patent.

Patented July 10, 1217.

Application filed J 1113 19, 1916. Serial No. 110,148.

To all whom it may concern:

Be it known that I, WILLIAM H. FRIGK, a citizen of the United States, residing at Philadelphia, in the county of Philadelphla and State of Pennsylvania, have invented new and useful Improvements in Reamers, of which the following is a specification.

My invention relates to machinists tools and refers especially to devices employed for truing and enlarging holes and commonly designated as reamers.

The chief objects of the improvements which form the subject matter of this application are: to provide a practical tool of the character stated in which the cutters are separate members so arranged that their salient edges may be uniformly and simultaneously adjusted relatively to the axis of the device: to furnish convenient and efficient means for clamping the cutters in position when adjusted: and to produce a reamer of the design specified in which provision is made for ready removal of the cutters or bits for the purpose of sharpening or repairs.

Further objects of this invention stated in detail may be mentioned as follows :to provide a dirt proof casing for the working parts thus adding to the durability of the mechanism; to arrange the cutter edges in such relatlon to each other as to remove the conditions which are prone to cause chattering; to furnish ample clearance for the clips, and, incidentally thereto, provide fixed points as a basis from which to index in the process of sharpening or milling the cutting elements.

The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawing in which z- Figure 1 is a perspective view of one form of the device.

Fig. 2 is a longitudinal section of Fig. 1.

Fig. 3 is a transverse section on the line 3-3 of Fig. 2. v

Fig. 4 is an end elevation viewed from the rear.

Fig. 5 is a perspective view of one of the cutting elements.

Fig. 6 is a perspective view of the adjust ing gear. Y

Referring to the drawing, the reference numeral 25 indicates the body of a bit holder, cylindrical in form, having a re duced portion, or neck 26, at the rear end and furnished with a central bore 27 extending entirely through the holder. Arranged concentrically to the axial line of the holder is a series of channels or grooves 28, cylindrical in form, and having one side open to the periphery of the'holder. These grooves 28 extend to the face of the body 25, at the frontend but stop short of the rear end leaving a supporting bridge of material 29. Within the said channels are located cylindrical cutting elements or bits 30 each having a suitable longitudinal channel 31 upon one side, so formed as to leave a salient lip 32 which forms the cutting edge of the bit. The cutting elements are held in their seats or channels 28 from lateral displacement by the over-hang of the curved walls of said channels and are retained from longitudinal displacement by screws 33 which pass through holes 34 in the bridges or ends 29 of the channels, and are received in threaded holes 35 in the rear ends of the bits or cutters 30. The bits have a turning fit in their seats or sockets 28 and when the said screws 33 are loosened the bits may be rotated in their sockets by the following means: The forward. ends of the bits are furnished with gear teeth 36 which extend part way around the periphery of the cylinder thus forming an incomplete or sequent pinion. The front end of the body 25 of the holder is counterbored, as shown at 37, to receive a gear wheel 38 which meshes with the teeth 36 cut in the bit. The said gear 38 has a central hole 39 and a hub 40 projecting upon one side only and fitted to turn in the bore 27 of the body of the holder in which it is lodged. The outer side of the gear 38 is supplied with holes or sockets 41 for the application of a spanner wrench or equivalent tool for turning'the gear. The said hub 40 has a bore 42 larger than the hole 39, and decentered so that one side of the hub wall is much thicker than the other as shown at 43. Through this thick part is drilled a longitudinal hole 44, which extends through the gear wheel. The wall 43 is split longitudinally by a slot 45, and the wall adjacent said slot upon both sides thereof is separated from the gear wheel for a short distance by a transverse cut 46. The portions of the wall upon each side of the hole 44 will consequent upon these cuts have a certain amount of resiliene and may be separated by means of a we 1c in the tation.

form of a screw 47, having a slightly tapering body, and provided with threads 48 near the head only to engage the hole where it passes through the gear. When this screw wedge is inserted the tapering body will slightly separate the free portions of the wall 43 and bind the hub firmlyin the body, holding the gear-38 and intermeshing bits 30, securely in position.

-The centers of the cutters or bits 30 are spaced irregularly in the circle to prevent the tendency to chatter which is likely to occur when" the cutting lips are equally spaced. Thereamer thusdescribed in detail, when in actual use is-attached to a lathe or other machine in dinary form by the engagement of the bore 27 of the body by a mandrel (not shown), and the method of operating the mechanical movements in the form disclosed above is as follows :The screws 33 having been slightly loosened and the wedge pin or screw 47 withdrawn sufiiciently to free the hub of the" gearwheel 38 frointhe body, a spanner wrench is applied to the sockets 41, and the wheel turned until the cutting lips 32 are projected to produce the caliber required. The screws 33 are then tightened and the wheel 38 clamped in position by means of the screw we go 47. 1. I claim':,

1. In a reamer, the combination with a hollow holder, of cylindrical cutters rotatably mounted in said hollow holder and provided with gear teeth, a gear engaging said teeth, and means engaging the bore of said holder for locking said gear against ro- 2. In a reamer, the combination with a hollow holder, of cylindrical cutters rotatablymounted upon the hollow holder and provided with gear teeth, a gear engaging said teeth, means for locking said gear, and nieans'independent of the gear for retaining said cutters in their seats.

In a. reamer,

I v the combination with a hollow holder,

of cutters rotatably mounted upon theholder and provided with gear similar threads in the same manner as tools of or-- teeth, a gear journaled upon the holder and engaging said teeth, an expansible hub for the gear journaled in the bore of said holder, and means for expanding said hub.

7 l. In a reamer, the combination with a hollow holder, of cutters rotatably mounted upon said holder and provided with gear teeth, a gear engaging said teeth, an expansible hub for the gear journaled in the bore of said holder, means for expanding said hub, and retaining mea'ns for the cutters.

5. In a reamer, the combination with a hollow holder, of cutters rotatably mounted upon the holder and provided with gear teeth, a gear engaging said teeth, a split expansible hub for the gear journaled in the bore of said holder, and means coacting with said hub for expanding the same.

6. In a reamer, the combination with a hollow holder, of'cutters rotatably mounted upon the holder, a gear meshing with said cutters, an expansible hub for the gear, said holder and gear hub being provided with coacting friction surfaces and means for effectingexpansion and contraction of said hub to throw said surfaces intoand out of frictional engagement.

7. In a reamer, the combination with a holder, of cutters rotatably mounted upon the holder, said cutters having gear teeth, a gear journaled upon the holder and meshing with said gear teeth, said gear having a portion adapted to be thrown into' and out of frictional engagement with the holder, and means for controlling said portion.

8. In a reamer, the combination of a hollow holder, a sleeve mounted upon the hollow holder, cutting elements 'rotatably mounted upon. the sleeve, a gear having a hub rotatably mounted upon the holder and in meshing engagement with said cutters, means for retaining the sleeve and cutters in position, and means for throwingthe gear into and out of frictional locking engagement with the holder.

In testimony whereof 'I-afiix my signature.

IVILLIAM 'I-I. FRICK.

Copies '05 thi's'patentmaj be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

